Some of my friends are sporting wristbands these days that keep track of their bodies. Little computers nestled in these device inside record the steps they take each day, the beats of their heart, the length of their slumbers. At the end of each day, they can sit down at a computer and look at their data arrayed across a screen like a seismogram of flesh.

I got one of these devices as a gift recently. But as much as I enjoy wasting time with technology, I just didn’t care enough to put it on my wrist. I already know that I should run more, walk more, stand more, and avoid sitting in front of monitors more. I don’t need granular